I've never had something that low, but I'm also looking at roughly $30k in equity on this property. 

It’s good to budget for unforeseen expenses.Regarding PMI, it’s worth discussing directly with your loan servicer since many lenders require holding the property for a period or reaching specific equity thresholds before removal.If market rents are $2,200–$2,500, hiring a property manager could help you optimize rent while taking the burden of tenant screening off your plate.

Again, if your $250k is true, and includes all the electrical upgrades, new plumbing runs, potentially new foundation pour (since I assume the existing garage slab is not capable of supporting a new two story house), I am guessing since I don't know the market, but assume you will have a lot of equity by completing the project.

If one tenant moves out, the property remains cash-flow positive.

Then generally the best advice is to buy in the best area that you can afford, even if the cash flow isn’t as good in year one you will get more market appreciation in equity and rent growth in the better area.

Sullivan recommends the cooperative ownership model as the ideal structure for MHPs what is stopping you from forming either a high or low equity co-op and purchasing the park from SCI?

I haven't dug into the actual agreement, but was curious because I'm not in a position to house hack, but see many people on here recommend the strategy.

If you're looking to scale it could be worth while to sell and re-distribute that equity with the help of some save leverage. 

Me and my wife have decided to sell our first duplex deal after 4 years of holding it we have built over 250k of equity wow ! 

If you can drive up the number of reviews (hopefully all positive) then you can also probably get a bump in the algorithms.